Featuring Light Elite cushioning with added protection in the ball and heel of the foot, these socks are every runners dream! The PhD Run Light Elite Micro socks feature the 4 Degree Elite Fit System which consists of two elastics for greater stretch and recovery to ensure your socks stay in place and specific mesh ventilation zones for increased breathability and moisture management. This low cut, micro sock is also made of 51% Merino wool so it's naturally anti-microbial and moisture wicking. And because it was designed for runners by runners there are added features like a padded Achilles tab and a virtually seamless toe for premium comfort, mile after mile.